From 0904f407eb33b0db2e04272935efd61d495118e4 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg42.2a@gmail.com>
Date: Thu, 23 May 2013 14:19:10 +0200
Subject: add small script to check context distro for diffs

---
 whatsnew.lua | 171 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 whatsnew.lua

diff --git a/whatsnew.lua b/whatsnew.lua
new file mode 100644
index 0000000..30cf837
--- /dev/null
+++ b/whatsnew.lua
@@ -0,0 +1,171 @@
+#!/usr/bin/env texlua
+--[===[--
+
+    whatsnew.lua -- Scan Context for changes in Lua libraries.
+                    Part of the Lualibs package.
+                    https://github.com/lualatex/lualibs
+
+    Copyright 2013 Philipp Gesang
+    License: GPL v2.0
+
+--]===]--
+
+-----------------------------------------------------------------------
+---                          configuration
+-----------------------------------------------------------------------
+
+local prefixsep     = "-"
+local namespace     = "lualibs"
+local luasuffix     = ".lua"
+local basedir       = "/home/phg/context/tex/texmf-context/tex/context/base"
+local cmd_diff      = [[diff "%s" "%s"]]
+
+-----------------------------------------------------------------------
+---                             locals
+-----------------------------------------------------------------------
+
+local iopopen       = io.popen
+local stringexplode = string.explode
+local stringformat  = string.format
+local stringsub     = string.sub
+local tableunpack   = table.unpack
+
+-----------------------------------------------------------------------
+---                              files
+-----------------------------------------------------------------------
+
+--- (prefix, keep) hash_t
+local namespaces = { { "l"    , false },
+                     { "util" , true  },
+                     { "trac" , true  }, }
+
+--- (prefix, name list) hash_t
+local filenames = {
+  ["l"] = {
+    "boolean",
+    "dir",
+    "file",
+    "function",
+    "io",
+    "lpeg",
+    "lua",
+    "math",
+    "md5",
+    "number",
+    "os",
+    "package",
+    "set",
+    "string",
+    "table",
+    "unicode",
+    "url",
+  },
+
+  ["trac"] = { "inf" },
+
+  ["util"] = {
+    "deb",
+    "dim",
+    "env",
+    "jsn",
+    "lua",
+    "prs",
+    "sta",
+    "sto",
+    "str",
+    "tab",
+    "tpl",
+  },
+}
+
+-----------------------------------------------------------------------
+---                             helpers
+-----------------------------------------------------------------------
+
+--- string -> string -> bool -> (string, string)
+local mknames = function (pfx, name, keeppfx)
+  local libname = basedir .. "/" .. pfx
+               .. prefixsep .. name .. luasuffix
+  local ourname = prefixsep .. name .. luasuffix
+  if keeppfx == true then
+    ourname = prefixsep .. pfx .. ourname
+  end
+  ourname = namespace .. ourname
+  ourname = "./" .. ourname
+  return ourname, libname
+end
+
+--- string -> (int * int)
+local count_changes = function (str)
+  local added, removed = 0, 0
+  for n, line in next, stringexplode(str, "\n") do
+    local first = stringsub(line, 1, 1)
+    if first == "<" then
+      removed = removed + 1
+    elseif first == ">" then
+      added = added + 1
+    end
+  end
+  return added, removed
+end
+
+--- string -> string -> (int * int)
+local run_diff = function (f1, f2)
+  local cmd = stringformat(cmd_diff, f1, f2)
+  local res = iopopen(cmd, "r")
+  local dat = res:read"*all"
+  res:close()
+  return count_changes(dat)
+end
+
+-----------------------------------------------------------------------
+---                              main
+-----------------------------------------------------------------------
+
+local libs_done     = 0
+local total_added   = 0
+local total_removed = 0
+
+for n, namespace in next, namespaces do
+  local pfx, keeppfx = tableunpack(namespace)
+  local libs = filenames[pfx]
+  for i=1, #libs do
+    libs_done = libs_done + 1
+    local current = libs[i]
+    local from, to = mknames(pfx, current, keeppfx)
+    if lfs.isfile(from) and lfs.isfile(to) then
+      local added, removed = run_diff (from, to)
+      if added > 0 or removed > 0 then
+        total_added   = total_added + added
+        total_removed = total_removed + removed
+        print(stringformat(
+          "(library %q (plus %d) (minus %d))",
+          from, added, removed
+        ))
+      end
+    else
+      if not lfs.isfile(from) then
+        print("cannot read file", from)
+      elseif not lfs.isfile(to) then
+        print("cannot read file", to)
+      end
+      goto fail
+    end
+  end
+end
+
+::done::
+if total_added == 0 and total_removed == 0 then
+  print "stagnation"
+else
+  print(stringformat(
+    "(progress (n-files %d) (added %d) (removed %d))",
+    libs_done, total_added, total_removed
+  ))
+end
+os.exit(0)
+
+::fail::
+print "fatal error"
+os.exit(1)
+
-- 
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